package com.itheima.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.common.BaseContext;
import com.itheima.common.CustomException;
import com.itheima.common.R;
import com.itheima.entity.*;
import com.itheima.mapper.OrderMapper;
import com.itheima.service.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
@Slf4j
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;
    @Override
    @Transactional
    public void submit(Orders orders) {
        //获得当前用户id, 查询当前用户的购物车数据
        Long userid=BaseContext.getCurrent ();
        LambdaQueryWrapper<ShoppingCart> qw=new LambdaQueryWrapper<> ();
        qw.eq (ShoppingCart::getUserId,userid);
        List<ShoppingCart> shoppingCarts=shoppingCartService.list (qw);
        if(shoppingCarts==null||shoppingCarts.size ()==0){
            throw new CustomException ("购物车为空");
        }
        // 根据当前登录用户id, 查询用户数据
        User user=userService.getById (userid);
        // 根据地址ID, 查询地址数据
        Long bookId=orders.getAddressBookId ();
        AddressBook addressBook=addressBookService.getById (bookId);
        if(addressBook==null){
            throw new CustomException ("用户地址有误，不能下单");
        }
        long orderId = IdWorker.getId();//订单号

        AtomicInteger amount = new AtomicInteger(0);
        // 组装订单明细数据, 批量保存订单明细
        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            amount.addAndGet(item.getAmount().multiply(new BigDecimal (item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());
        //组装订单数据
        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(userid);
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));
        //向订单表插入数据，一条数据
        this.save(orders);

        //向订单明细表插入数据，多条数据
        orderDetailService.saveBatch(orderDetails);

        //清空购物车数据
        shoppingCartService.remove(qw);
    }

    @Override
    public R<Page> OrdersByPages(long page, long pageSize, Long number) {
        Page<Orders> pages = new Page<>(page, pageSize);
        //条件构造器
        LambdaQueryWrapper<Orders> lqw = new LambdaQueryWrapper<>();
        lqw.eq(number != null, Orders::getNumber, number)
                .orderByDesc(Orders::getOrderTime);
        orderMapper.selectPage(pages, lqw);
        return R.success(pages);
    }

    @Override
    public void updateStatus(Orders orders) {
        //条件构造器
        LambdaQueryWrapper<Orders> lqw = new LambdaQueryWrapper<>();
        lqw.eq(Orders::getId, orders.getId());
        Orders orders1 = orderMapper.selectOne(lqw);
        orders1.setStatus(orders.getStatus());
        orderMapper.updateById(orders1);
    }

    @Override
    public R<Page> OrdersByPages(long page, long pageSize) {
        //分页构造器
        Page<Orders> pages = new Page<>(page, pageSize);
        //条件构造器
        LambdaQueryWrapper<Orders> lqw = new LambdaQueryWrapper<>();
        lqw.orderByDesc(Orders::getOrderTime);
        orderMapper.selectPage(pages, lqw);
        return R.success(pages);
    }

    @Override
    public void again(Orders orders) {
        //获取订单号
        Orders orders1=orderMapper.selectById (orders.getId ());
        String number=orders1.getNumber ();
        //条件构造器
        LambdaQueryWrapper<OrderDetail> lqw=new LambdaQueryWrapper<> ();
        lqw.eq (OrderDetail::getOrderId, number);
        List<OrderDetail> orderDetailList=orderDetailService.list (lqw);
        List<ShoppingCart> list=orderDetailList.stream ().map ((item) -> {

            ShoppingCart shoppingCart=new ShoppingCart ();
            //添加购物车
            shoppingCart.setName (item.getName ());
            shoppingCart.setImage (item.getImage ());
            shoppingCart.setDishId (item.getDishId ());
            shoppingCart.setUserId (BaseContext.getCurrent ());
            shoppingCart.setSetmealId (item.getSetmealId ());
            shoppingCart.setDishFlavor (item.getDishFlavor ());
            shoppingCart.setNumber (item.getNumber ());
            shoppingCart.setAmount (item.getAmount ());
            return shoppingCart;
        }).collect (Collectors.toList ());

        shoppingCartService.saveBatch (list);

    }
}